Automatically-threading loom shuttle



Dec. 16, 1930.

c. D. BROWN" AUTOMATICALLY THREADING LOOM SHUTTLE Filed Feb. 25, 1950 ATTORNEY Patented Dec. 16, 1930 UNITED S A PATENT] opt-IC i cent 1). isnown, or HorEnALnMAssAoHUsErrs, Assmmsa 'roIDitAPEnoonronA- TION, on HOPED-ALE, MAss oHUsETTsQA oonroRATroN or MAINE AUTOMATICALLY-THREADIfiG Looitt SHUTTLE-g Application filed February 25, 1930. Seria1 no. 431,235.

This invention 3 relates to automatically threading loom shuttles .and is more particularly directed to the means for exerting uniform tension upon the thread throughout the weaving operation. a i y During weaving the thread delivered from the shuttle is alternately subjected to. a pull during the flight of the shuttle and then to a slackening. of the thread as the shuttle comes to rest and such slackening of the thread may occurat other periods during weaving. It is important in weaving certain kindsor ehara-ctersof filling, such for instance as silk, artificial silk, rayon and other fine filling that the thread be uniformly tensioned, otherwise the'defect will be manifested in the resulting cloth. 7 It has been proposed heretofore towrap the thread about a rigid arm extending longitudinally of the shuttle, but in such cases reliance has been placed solely upon frictional retardation offered the thread as it is withdrawn from the shuttle and in such cases no provision has been made' yieldingly acting uponthe thread as it is withdrawn from the shuttle under the thread pull to take up slack. i I

One of the objects of the present invention is to provide thread tensioning members constituted as a plurality of arms extendinglom gitudinally of the thread passage and one of which, at least, is yieldable and to cause the thread to be wrapped about the plurality of arms as a unit on thefirst pick ofthe shuttle following replenishment, so that the tensioning members may yield relatively to a pull upon the thread wrappmgs and thereafter act to take up'slackwhen the pull of the thread is released. 1 1 Y The invention and novel features thereof are best made clear from the following description and accompanying drawings of one good form thereof.

.Inthe drawings Fig. 1 is a plan view of an automatically threading shuttle containing the present-invention, some of the parts being broken away; and p Fig. 2 is a perspective view of the dellvery end of an .automaticallyethreading shuttle containing the present invention and having the threading; block removed to show the parts be eath. 1 a

, In filling replenishing looms where the filling in the shuttle is changed from time to time the shuttle is provided with means for detachably holding the filling carrier or bobbin, but as these features are common, and well known, in the art they are not herein shown and described. y y

- In.-the drawings the shuttle 1 is provided with a bobbin chamber 2 in which the filling carrier or bobbin 3 detachably held as usual andforward of the bobbin chamber the shuttle is provided ,with a longitudinal thread passage d and aside deliveryeye 5 which communicates therewith. Shuttles of the replenishing type are usually provided with a threading block tofacilitate automatic threading during'the picking operation'followingreplenishmentof filling and in the present instance of the invention thethreading block is shown as a top plate 6 which is securedtot-he, shuttle by a bolt or screw 7 extending through a side flange 8 of the top plate. The top plate extends over the longitudinal thread passage towards the opposite wall thereof where a space9 is provided for the-entrance'of the thread intothe longitu passage 4 are the tensioning members12 and j l3which have the end portions remote from thebobbin c'hamberseured to the shuttle and their other ends free. U

- In the presentinstance of the invention the tensioning member 12, constituted as an arm extending longitudinally of the thread passage, issecured to. theshuttle by a pin or bolt .14 rising fromthe lower portion ofthe thread passage and from the bolt or pin 14; the tensioning member 12 extends laterally at 15 and then towards the bobbin chamber as indicated, where its free end portion is provided with a projection or knob 16;

The companion tensioning member 13 in the present instance is secured to the shuttle by a bolt or pin 17 located in the sidewall of the shuttle and from the bolt or pin the tensioning member 13 extends inwardly at 18 and is then turned toward the bobbin chamher where its free end is provided with a projection or knob 19.

The tensioning member '13 isznormally under the influence of a spring 20 which may be conveniently constituted as a strip of rubber having one end 21 secured to a projecting portion 22 of the tensioning member and its other end portion secured to a bolt or pin 23, as more clearly illustrated in Fig. 1, and in order to provide for variation in the yieldability of the tensioning member 13, the pin or bolt 23'is made rotatively adjustable.

In the present instance of the invention two tensioning members are shown, but it is to be understood that any desired number may be employed and'such tensioning members may have their portions remote from the bobbin chamber secured to the shuttle in any convenient manner.

As hereinbefore stated the tensioning mem bers are to act uponthe thread resiliently to yield under the thread pull and take up slack and to this end one at least of the tensioning members is made yieldable towards and from the other tensioning member. As shown, however, both tensioning members are yieldable and each is provided with a series of bends 24 for receiving the thread wrappings as will be later described, on the first pick of the shuttle following replenishment.

In accordance with one feature of the pres ent invention the thread is wrappedabout the plurality of tensioning members as a unit by progressive turns of the thread about the tensioning members from a point remote from the bobbin chamber, a condition which is effected by an elongated spiral having its end remote from the bobbin chamber secured to the shuttle independent of the tensioning members.

The elongated spiral is secured to the shuttle on the pin or bolt 14 from which point it extends longitudinally of the thread passage at 25 and from the end of the part 25 the spiral is passed about the plurality of tensioning members as at 26 with its end portion adjacent the bobbin chamber free. Thus the coils of the elongated spiral enclose both tensioning members and serve to direct the swirling thread about these tensioning members on the first pick of the shuttle following replenishment, commencing at a point remote from the bobbin chamber and also serve to limit the relative separating movement of the tensioning members. In some cases it is desirable that the tensioning members be angularly related in the longitudinal thread passage and as shown the two tensioning members diverge outwardly from their ends remote from the bobbin chamber towards the bobbin chamber.

When filling replenishment is effected the thread a will pass downwardly through the opening 9 into the longitudinal thread passage and as the shuttle is picked following replenishment the swirling thread will be directed by the forward end portion of the elongated spiral or helix about the two tensioning members at a point remote from the bobbin chamber and then the thread will be wrapped about the two tensioning members as a unit progressively towards the bobbin chamber until finally the thread passes into the elongated spiral or helix as indicated in Fig. 2.

On the first pick of the shuttle following replenishment therefore the thread will be wrapped about a plurality of tensioning members progressively from portions thereof remote from the bobbin chamber as directed by the elongated spiral or helix and during the weaving operation the tensioning members will yield relatively towards each other under the pull of the thread to thereby maintain uniform tension and when the thread becomes slack the tensioning members will separate relatively to takeup slack so that during the entire weaving operation the tension on the thread will remain uniform and constant and perfect cloth will be woven.

What is claimed is 1. An automatically threading loo'm shuttle having a bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith, a plurality of thread tensioning members constituted as arms extending longitudinally of the thread passage, and a spiral unattached to and the coils of which enclose said plurality of tensioning members for directing the thread progressively about said tensioning members as a unit on the first pick of the shuttle following replenishment. V

2. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith, a plurality of thread tensioning members constituted as arms extending longitudinally of the thread passage, one of which is yieldably responsive to thread pull, and an elongated spiral mounted independent of and the coils of which enclose said plurality of tensioning members to limit their movement of separation and cause the thread to be wrapped about the plurality of tensioning members as a unit on the first pick of the shuttle following replenishment of filling.

3. An automatically threading loom shuttle havinga bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith, a plurality of thread tensioning members extending longitudinally of the thread passage with their ends remote from the bobbin chamber secured to the shuttle fand their opposite ends free for relative movement towards and from each the shuttle.

4. An automatically threading loom shut- 'tle having a bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith, a plurality of thread tensioning members constituted as resilient arms extending longitudinally of the thread passage with their ends remote from the bobbin chamber secured to the shuttle and their opposite ends free for relative move-' ment towards and from each other, and an elongated spiral independent of the tensioningmembers having its coils enclosingthe plurality of tensioning members for directing the thread progressively about the plurality of tensioning members as a unit as the thread is withdrawn from the shuttle.

5. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith, a plurality of thread tensioning members extending longitudinally of the thread passage with their ends remote from the bobbin chamber secured to the shuttle and their opposite ends free for relative movement towards and from each other, and an elongated spiral independent of the tensioning members with its end remote from the bobbin chamber secured to the shuttle and having its coils enclosing the plurality of tensioning members for directing the thread progressively about the plurality of tensioning members as a unit as the thread is withdrawn from the shuttle.

bin chamber secured to the shuttle and their other ends free, one of which is yieldable,

and an elongated spiral secured to the shuttle with its coils enclosing the two thread tensioning members.

8. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passageand a delivery eye communieating therewith,-a plurality of thread tensioning members extending longitudinally of the thread passage and relatively yieldable under the pull of a threadwrapped about them as a unit, and an elongated spiral having its end remote from the bobbin chamber secured to the shuttle with its coils enclosing the tensioning members and its other end free for causing thethread to be wrapped about the tensioning members progressively from their forward portions.

9. An automatically threading loom shut-' tle having a bobbin chamber, a long tudinal thread passage and a side delivery eye, two thread tensioning members constituted as arms extending longitudinally of the shuttle in relatively diverging relation, and a helix, the coils of which enclose the two tensioning members for directing the thread about the two tensioning members as a unit progressively from their portions more remote from the bobbin chamber.

In testimony whereof, I have signed my name to this specification.

I CARL D. BROWN.

6. An automatically threading loom shutpassage with their ends remote from the bob- 

